Extract config_file method from action_class to enable external access

libraries/helpers.rb

@@ -104,6 +104,10 @@ def debian_9?
       def ubuntu_18?
         platform?('ubuntu') && node['platform_version'].to_f == 18.04
       end
+
+      def nginx_site_config_file(conf_dir, site_name)
+        ::File.join(conf_dir, "#{site_name}.conf")
+      end
     end
   end
 end

resources/site.rb

@@ -63,13 +63,13 @@
           description: 'Additional helper modules to include in the site template',
           coerce: proc { |p| p.is_a?(Array) ? p : [p] }
 
+def config_file
+  nginx_site_config_file(conf_dir, name)
+end
+
 action_class do
   include Nginx::Cookbook::ResourceHelpers
 
-  def config_file
-    ::File.join(new_resource.conf_dir, "#{new_resource.name}.conf")
-  end
-
   def config_file_disabled
     "#{config_file}.disabled"
   end

spec/unit/resources/site_spec.rb

@@ -46,4 +46,28 @@
 
     it { is_expected.to delete_file('/etc/nginx/conf.http.d/default.conf') }
   end
+
+  context 'config_file method accessibility' do
+    recipe do
+      nginx_install 'distro'
+
+      site = nginx_site 'test-site' do
+        conf_dir '/etc/nginx/sites-available'
+        action :create
+      end
+
+      # This tests the new functionality - accessing config_file on the resource instance
+      ruby_block 'test_config_file_access' do
+        block do
+          expected_path = '/etc/nginx/sites-available/test-site.conf'
+          actual_path = site.config_file
+          raise "Expected #{expected_path}, got #{actual_path}" unless actual_path == expected_path
+        end
+        action :run
+      end
+    end
+
+    it { is_expected.to create_template('/etc/nginx/sites-available/test-site.conf') }
+    it { is_expected.to run_ruby_block('test_config_file_access') }
+  end
 end